Moisture-Responsive Friction Adaptability: Rethinking the Conventional Skin Silicone Interfaces in Pressure Injury Prevention Dressing Designs

Abstract

This study evaluated the frictional properties of the skin-contact interfaces of two multilayer prophylactic dressings under simulated perspiration conditions. The tested dressings were identical except for the skin-contact interface, which was either silicone-made or Hydrofiber-made, that is, AQUACEL Hydrofiber Technology. Using a standardised tribological 'sled test' setup and a skin-mimicking polymer substrate, we measured the static and kinetic coefficients of friction for each dressing interface type at varying moisture levels. The dressing with the Hydrofiber interface consistently demonstrated significantly lower static and kinetic coefficients of friction compared to the silicone-based dressing, across all moisture conditions. The Hydrofiber interface exhibited a sharp coefficient of friction reduction with minimal (5%) moisture accumulation, mimicking overnight perspiration under thermoneutral conditions. This dressing maintained the low coefficient of friction levels at a steady level of approximately 0.2 until full saturation. In contrast, the silicone interface retained high (> 1) coefficients of friction regardless of moisture. These findings highlight an important biomechanical advantage of Hydrofiber skin-contact materials in reducing frictional forces at the skin-dressing interface, especially in moisture-prone body areas, in a pressure injury prevention context. Friction-responsive skin-contacting dressing materials with low coefficients of friction, which remain low while they become moist due to perspiration accumulation, should be preferred for preventative dressings.